Floating chair type seat



Nov. 3, 1942. A. F. HICKMAN FLOATING 'CHAIR'TYPE SEAT Filed April 9 1941 3 Sheets-Sheet 1 ATTORNEYS Sheet-Sheet 2 Nov. 3, 1942. F. HICKMAN FLOATINGQHAIR TYPE SEAT Filed April 9, 1941 I INVEN OR m'n onfievs "Nov. 3, 1942 A. F. HICKMAN FLOATING-CHAIR TYPE SEAT Filed April 9, 1941 3 Sheets-Sheet 3 gmvszfroR m "Patented Nov. 3, 1942 g sEa'r I Albert F. Hickman, Eden, N. #1., assignor to Hlckman Pneumatic Seat 00., Inc., corporation of New York Eden, N. 1., an

Application April 9. 941, Serial No. 387,642 I for. 155-.-9

., 7 (ilaimse This invention relates to a seat and more particularly to a resiliently mounted floating chairtype seat particularly adapted for use in vehicles 'such as busses, passenger railroad cars, and passenger .airplanes to cushion the passengers against objectionable or-harmful shocks, jars and vibrations caused by the vehicle passing over uneven roads or rails.

v The present invention is an improvement on the general type of resiliently suspended seats described and claimed in my prior United States Patents Nos. 1,774,009 and 1,929,023, granted August 26, 1930, and October 3, 1933, respectively, and in my copending application for patent Serial No. 373,273, flled.January 6, 1941. I

It is the principal object of this invention to provide a resiliently-mounted floating chair type seat having the superior ride characteristics of the seats shown in my said patents and copend ing application and at the same time designed chair type seat in which adequate cushioning is provided with a very small vertical movement for use in common 'carriers, such as passenger busses, where space between the seatsis ata premium but where the seats are mounted at a higher elevation than in trucks or pleasure cars, for example. 4

Another object of the invention is to provide such a resiliently mounted floating chair type seat having its spring suspension arranged essentially underneath the seat which adequately prevents objectionable jars and vibrations of all frequencies from being transmitted to the'body.

of. .the seated passenger and in which the spring suspension yieldingly prevents undue movement of the seat and has rapid loading and unloading characteristics beyond the normal range of movement of the seat.

Another object of the invention is to provide such a resiliently mounted floating chair type seat having its spring suspension arranged essentially underneath the seat; inwhich the spring suspension controls the direction of moveing means is in the form of inexpensive metal springs thereby to permit the quantity production of seats embodying the invention at very low cost.

' ment of the seat frame and in which the spring- Another object is to provide a floating, guided andresiliently mounted floating chair frame type seat which is so constructed as to permit its use in the horizontally curtailed space P Qvided in a bus, passenger car or passenger airplane for such seats, which is strong and durable and will operate smoothly and easily without attention, which ll Iight in weight to permit its use in airplanes and in which the moving parts are ade-' for the seat. 40

" vention. v

" Fig; 2'is a side elevation thereof showing-parts quately guarded so that there is no danger of the passenger sufiering injury while riding on the seat.

Another object is to provide such a floating guided and resiliently mounted chair frame which "is swivelly mounted so as to .be capable of being rotated about a vertical axis and thereby permit the passenger to adjust the chair frame to suit any direction he may desire: I a

Another object is to provide'such a resiliently mounted floating chair type 'seat having its spring suspension arranged essentially underneath the seat in which the back part of the chair frame is capable of being adjusted to any desired angle of inclination relative to the seat part thereof thereby to permit the passenger to adjust it to either an erect or any desired reclining'position.

Another object is to provide such-a floating of the chair fra e and in which'friction shock absorbersare. unnecessary to the proper operation of-theseat.

Other objects of the invention are to provide such a floatingchair type seat which is simple and inexpensive in construction. is composed of few parts which are not liable to get out of order, which does not require frequent servicing, and whichwillnot develop objectionable squeaks or noises even when subjected to conditions of severe and constant use. v

' In the accompanying'drawings:

Fig. 1 is a'perspective view of one form of resiliently mounted chair type seat embodying my inbroken away.

Fig. 3 is a perspective view of the subirame Figs. 4 and 5 are fragmentary, generally horizontal sections, taken on the correspondingly numbered lines on F18. 2.

. showing the subframe used in the form Fig.6 is a view similar to Fig. 1 showing a mod- 'ifled form of the invention in which the seat is capable of'swiveling or rotating about a' vertical axis.

Fig. 7 is a side elevation similar to Fig. 2 and showing the modified form of the invention shown in Fig. 6.

, Fig. 8 is a perspective view, similar to Fig. 3,

of the invention' shown in Figs. 6 and 7.

Fig. -9 is.an enlarged horizontal section, taken on line '99,- Fig. '73, and showing parts broken away.

' frame of the seat part III is shown this application, the seat is composed'of a cush ioned chair-like seat frame having a back part which is rigidly, but adjustably, connected with a seat part, a subframe, and a resilient spring suspension between the chair-like seat frame and the subframe which resiliently supports the chair-like seat frame and permits resilient,

guided movement of the seat frame relative to the subframe. As the same construction of chair-like seat frame is used with both forms of the invention shown, its construction will be first described, this description applying, of course, to both forms of the invention illustrated.

The cushioned chair frame or seat frame is shown as comprising a seat part to, rigidly, but

adjustably, connected with aback part II. The as composed of an angle iron bent to provide a horizontal front cross bar l2 and side bars or legs i3 which extend rearwardly from the extremities of the front crossbar l2. These bars are arranged so as to form a continuous upwardly extending side flange and a continuously extending bottom flange thereby to provide a recessedframe for the reception of a removable seat cushion l4. This seat cushion can be of any suitable type but is preferably of the unvented type described in detail in my said copending patent application for Floating chair type seat, Serial No. 373,273, filed January 6, 1941.

The frame of the back part II of the seat frame is shown as composed of an angle iron bent to provide a horizontal upper cross bar I5 and side bars or legs l6 which extend downwardly from the extremities of this upper cross This spring locking finger extends upwardly therefrom. The front edge 2| of this plate 20 preferably inclines upwardly and rearwai'dly and terminates in an upper rounding edge 22. Concentric with this rounding edge 22, each of the plates 20 is shown .as carrying a pivot bolt 23, the pivot bolts at opposite sides of the chair frame being axially in line with each other. The plate 20 also carries a locking finger 25 which is shown as riveted to this plate 20 at its lower end and as extending upwardly therefrom. The upper end 21 of this locking finger projects above the upper end of the plate 28 and is formed to provide a fingerpiece. This locking finger 25 is made of spring metaland the fingerpiece 21 is formed "to permit the manual movement of the spring finger 25 outwardly. Near its upper end this spring finger 25 carries a pin 28 which is arranged within a hole 29 provided in the plate 28. 25 can be provided at one or both sides of the seat.

Each of the pivot bolts 23 extends through a plate 30 which is secured to the lower end of the side legs or bars l6 of the back frame II. This plate extends forwardly from its leg l5 and is provided with an annular series of holes 3! which are arranged concentric with the pivot bolt 23 and in register with the pin 28 of the spring locking finger 25 so ,that this pin can enter any one of these holes 3|. It will therefore be seen that the pivotally connected plates 28 and 30, together with the locking finger 25, provides a very simple means which permit the adjustment of the back to any desired inclination.

Thus.- the occupant. by the use of the fingerpiece 21, can move the spring locking finger 25 outwardly so as to release its pin 28 from the engaged hole 3| and can thereupon place the back part of the seat at any desired inclination asindicated by the dotted lines in Fig'. 10 and reengage the pin 28 with the'corresponding one of the annular series of holes 3|.

The chair type seat frame, as above-described,

Q is shown as supported by either the form of subbar. These bars are arranged so as to form a continuously extending back flange and a continuously extending side flange thereby to provide a recessed frame for the reception of a removable back cushion 11. This seat cushion can be of any suitable type butis preferably of the vented type described in detail in my said copending patent application.

this plate I8, which levers form a part of the spring suspension for the chair frame, the lower comers of the rear seat cushion are recessed, as indicated at i9.

The frames l0 and II of both the seat part and the back part can be otherwise cross braced in any suitable manner andare shown as conhected to each other by an adjustment mechanism which permits the back part II to be adjusted to any desired reclining position relative to the seat part III to suit the choice of the occupant. For this purpose, as best shown in Figs. 10 and 11, a plate 20' is rigidly secured to the rear extremity of each of the side bars or legs |3' of the seat part of the chair frame and to the corresponding end of the plate l8 and frame and spring suspension illustrated in Figs.

1-5 or by the modified swivel type of subframe and spring suspension illustrated in Figs. 6-9. In the form of subframe and spring suspension shown in Figs. 1-5 the subframe, indicated'generally at 35, isshownas composed of sheet metal parts suitably welded together. These parts comprise a rectangular base 36 made of angle irons and having one horizontal flange adapted to be secured to the floor of the passenger bus, passenger airplane or passenger railroad car. To each of the front corners of the base 36 is secured a front corner post 31 which is shown as being L-shaped in horizontaI section. These posts support the opposite ends of a sheet metal cross plate 38, the front and rear edges of which are formed to provide upturned .fianges 39. These flanges 39 are so spaced as to hold or cradle the lowermost coils of a row of helical compression springs 48,

The chair frame is shown as supported on three of these helical springs 48 and the upper coils ofthese springs bear against a cross plate 4| secured at its opposite ends to the side legs l3 of the seat part H] of the chair frame, this cross plate being formed at its front. and rear edges to provide downturned flanges 42 which cradle and hold the upper coils of the springs 48 against fore and aft displacement. To hold the springs 48 individually against lateral displacement, a central row of retaining fingers 43 are struck upwardly'from the lower cross plate 38, these I socket inthe half bearing 66 fingers being arranged in pairs to engage the opposite sides of the lowermost coil of each helical spring .48. Similarly a central row of retaining fingers 44 are struck downwardly from the upper cross plate 4|, these-fingers 44 being arranged in pairs to engage the opposite sides of the uppermost coil of each helical spring 48.

Th subframe 36 also includes two rear posts 50 which are shown as being of angle form in cross section and as secured to and rising-from the rear corners of the base 36. These posts 58 are shown as being cross braced by horizontal connecting bars 5| which are welded to the rear sides of these posts and the posts 56 are also shown as being braced by diagonal bars 52 which extend forwardly and downwardly and each of which is secured at its lower end to the'corresponding side of the base 36. Each of the posts so that the rubber is flexed to provide the necessary rocking movement in the bearings 65.

To the seat part I is also secured a depending bracket 18 which is of generally vV-shaped form, each of these brackets having a vertical leg ll welded at its upper end to-the end of the corresponding side leg or bar I3 of the seat part I0 of the chair frame and having a for- -wardly and upwardly extending front leg'12 which is welded to the underside of thecorresponding side legyor bar l3 adjacent its center.

The lower ends of the brackets 10 are connected to the lower ends of the rearposts 58 of the subframe by a second yoke 680.. This yoke is identhe upper yoke 68 and hence the same reference numerals have been employed to designate similar'parts, these nu- 68 is provided at itsupper end with a hole 53 v which is adapted to receive a bolt 54, these bolts 54 being axially in line with each other. Similarly each of the posts 50 is provided near its lower end with a hole 55 which is adapted to receive a bolt 56, these bolts being axially in line with each other.

The chair frame is guided to' move in a generally vertical direction by a pair of yokes which meralsbeing distinguished by the sufliix a. Similarly, each end of the cross rod 6|a of the yoke 60a. is supported by a rubber bushed hearing 65a, each of these bearings being secured to the lower extremity of the vertical leg H of the corresponding bracket I0. These rubber bushed bearings 65a are identical v with the bearings 65 and hence the same referencemumerals have I been applied and distinguished by thesufiix a.

are preferably constructed and secured to the subframe and the chair frame as follows: The seat part |0.of the chair frame is connected, through its vertical cross plate l8, to the upper ends of the posts 50 by an upper yoke 60,

which is in the form of a cross rod 6| having an integral rearwardly extending arm 62 at each of its ends. At its rear end each of these rearwardly extending arms 82 is formed to provide an enlarged eyeor collar 63, these collars or eyes being in,1ine with each other and'their axis being parallel with the axis of the cross rod 6|. Each of.these eyes 68, as best shown in Fig. 4,

embraces the. corresponding bolt 54. Each of these bolts 54 carries a rubber bushing 64which The rear end of each of the arms 62a is connected to the corresponding stud bolt 56 by' a rubber bushed bearing formed by eyes 63a provided at the ends of its arms 62a. As these bearings are identical in construction to the bearings provided for the yoke 60, the same reference numerals have likewise been applied to similar parts and distinguished by the sufliix a.

In the modified form of subframe and spring suspension shown in Figs. 6-9 the base portion of the subframe comprises a casting 80 which is tightly confined between the bolt 54 and the I corresponding eye 63, this rubber bushing being flexed to provide the necessary rocking movement of the eyes 63 around the stud bolts 54. The head of each of the bolts 54 confines the rubber bushing 64 in position and also serves to retain the corresponding eye 63 in position.

Each end of thecross rod 6| of theyoke 68 is supported for rocking movement in a rubber bushed bearing 65, each of these bearings being secured :to the rear ,face of the vertical plate l8 of the seat part ID of the chair frame. As theserubber bushed bearings are-identical a description of one will be deemed to apply to both.

Each of these bearings 65 is shown as comprising a front half bearingmade'of a wooden block 66 and as having a horizontaly extending'half round socket in its rear face for the reception of a bushing 61 of resilient yielding material,-

such as rubber. This bushing surrounds the adjacent portion of the cross rod 6| and is held.

comprises a circular base 8| having'a largeupward tubular extension or sleeve 82 providing a cyl ndrical bore or'well adapted tocontain a body of oil 83. This base-89 supports a subframe in the form of.a casting 85 which is formed to provide a central post 86 which is received in the bore of the casting 80. This post is preferably hollow and open at its bottom so that a substantial body of oil for the purpose of insuring lubrication of the swivel joint provided by this post and the casting.

The lower extremity of the post 86 is preferably flanged inwardly; as indicated at 81, so as to provide adequate bearing for the post against the circular bottom 8| .of the casting 80.

The cas ing 85 is formed; at the upper end'of the post 86, to provide a forwardly projecting 6 arm 90, the extremity of which is provided-with a circular recess9l on its upper side. In this recess is fittted the lower coil of a helical comthe u per end of which is secured to the center of the plate 4| by the re pressi -n spring 92,

training fingers 44in the same manner as with the form of the'invention ehown in Figs. 1-5. Inasmuch as one spring 92 supplants the three helical compression springs 40 of the form of the invention shown in Figs. 1-5, this spring 92 is, of course, :heavien "-'I'he casting. 84 1s also formed to provide two i I arms 95 whichextend-rearwardly and laterally ing end of the vertical plate'l8otjthe seat part l8 of the subframe by a pair of bolts 69. As

.,with .the eyes 63 the rubber bushings 61 -are'.

tightly confined between the two half bearings an opening 98. at its lower from the up er end-of the post 86,-as best shown in Fig. 8'. The extremity-cf each of these arms 95 is. formd "to provide a posts having an opening 91 at iisupper endand end. The openings. 91

,are axially in line with each other and the same" is also true of the openings 98. The openings post 96, each of these" extremities of the chair movement of the chair frame.

81 each receives a bolt 89 and the openings 88 each receives a bolt I00.

As with the form of the invention shown in Figs. 1-5 the upper bolts 99 of the posts 96 are connected tothe vertical plate 18 of the seat part ill ofthe chair frame by a yoke 80b. This yoke and its rubber bushed bearings is identical in construction with the yoke 60 and the bearings for this yoke and hence not repeated, the same reference numerals having been applied to designate identical parts and distinguished by the sufiix b. Similarly, the lower pair of bolts I are connected to the lower brackets by a yoke 60c which is identical in construction and in the construction of its bushings with the yokes 60 and 60a and the description of this yoke 600 is therefore not repeated, the same reference numerals having been applied and distinguished by the sufflx c.

In the operation of either type of floating chair type of seat shown, when installed, for example, in a passenger bus, railroad car or airplane, the occupant is enabled to adjust the back part II of his seat to any desired inclination by withdrawing the spring finger 25 so as to release its pin 28 from the corresponding one of the series of annular holes 3| of the plate 30. This permits the operator to'adjust this back part to any inclination, as indicated by dotted lines in Fig. 10, following which he can release the spring finger and permit its pin 28 to reengage one of the holes 3|, which engagement will hold the back at the selected inclination.

With particular reference to the form of the invention shown in Figs. 1-5, the occupant, upon sitting on the seat cushion l4, depresses the entire seat frameto a position in which the rearwardly extending arms 62, 62a are in an approximately horizontal position, these yokes flexing the rubber bushings 81, 61a and 64, 84a in the eight rubber bushed bearings 65,'65a and 83,

88a of these yokes. The weight of-the occupant is primarily supported on the helical compression springs 40 interposed between the seat part I -of the chair frame-and the cross plate 38 of the supporting structure or subframe 35.

In traveling along; if mitted to the vehicl the chair frame is depressed, -this impact being largely absorbed by the helical springs 48 which are compressed. The eight rubber bushings for the upperand lower yokes 60, 60a are also stressed to a greater de-- gree by such violent upward impacts of the vehicle and the subframe. The arms 62, 62a of the yokes 60, 80a form, in effect, two sides of a frame is along substantially a straight line and that all .partsof the seat rection. This avoids any tipping or move in the same di- It will be seen that the length of these arms 62 and 62a of the yokes 80,

movement of the chair and seat frame and on securing adequate resilient cushioning of the chair frame with the minimum vertical fore and aftmovement thereof. It has been found that with'a floating chair I in vehicles the effective length of each/of the levers 82, 82a, that is, from its axis of pivotal 35 to its axis of-piv-. 75

connection on the subframe the description is a violent impact is trans- GM has a vital bearing on the type seat as shown for use 1 ceed flve inches.

I jointed parallelogram and it will therefore be otal connection on the chair-frame, must not ex- I With these arms of this length or less, the chair frame i properly guided in its movement and the weight of the chair frame and its occupant is. adequately carried by the light compression springs 40 and the rubber bushings shown.

In this downward movement of the chair frame relative to the subframe, it willgbe seen that the upper ends of the posts and the rear ends of the arms 62 -of the yoke enter the recesses 18 provided in the lower corners of the back cushion l'l, these recesses being provided for this purpose.

In the recoil or upward movement of the chair frame, the helical compression springs return the chair frame to the original loaded position in which the arms 82, are in a horizontal position, or slightly higher. It has been found that with the seat constructed as shown, the spring suspension has extremely rapid loading and thereby providing rapidly increasing resistance to vertical impacts of the vehicle frame and rapidly damping the rebound of the seat.

As with the seat shown in my said copending patent application Ser. No. 373,273, filed January 6, 1941, the seat cushion I4 is unvented, whereas the back cushion I1 is vented, thereby to obtain the superior ride characteristics as set forth'in greater detail in my said copending patent application.

With the form of the invention shown in Figs. 6-9 it will be seen that the spring suspension, that is, the rubber bushed yokes and the helical compression spring, is of substantially the same construction and arrangement as in the form of the invention shown in Figs. 1-5 and in this regard seat frame is capable of swiveling around a vertical axis, its post 88 being revolvably mounted in the base casting 80 for this purpose. Further, this swivel joint is adequatelysupplied with lubricant by the large body 83 of lubricant retained in this base casting and post.

It will be notedthat in both forms of the inifention the yokes are secured to the seat portion- III of the floating chair. frame and are arranged well under 4 what higher mounting for the seat, as compared,

"rocking I enabled to be placed a premium with for'example, in my said prior patents and application, a slightly higher mounting of the seat is desirable where the seat is to be used in a passenger bus, railroad train or airplane. At the same time by mounting the spring suspension essentially under the seat rather than partly in rear as well as partly under the "seat. the seats are closer together, the horizontal space between the seats being, of course, at seats arranged in rows as in a passengergbus, railroad car or airplane. From theforegoing itwill. be seen that 5 the present invention provides 'a floating chair type seat of simple and inexpensive construction, in which. the resilient support is obtained primarily by inexpensive metal springs and which has the 62a of the yoke 80, a

unloading characteristics,

in Figs. 6-9 is-essentially a the seat. While this requires a some-j ranged directly under the part and interposed between said upwardly pro- Further, the seat is so constructed as to have a very small vertical movement of its chair frame and at the same time is capable of adequately absorbing violent jars or shocks thereby permitting the use'of the seat in the extremely confined space permitted in a passenger bus, railroad car or airplane. The seat can also be adjusted as to the angularity of its back to suit each passenger and the seat is entirely free from squeaks or other noises and requires little servicing or attention even under conditions of severe and constant use. It will further be seen that with the arrangement of the spring suspension essentially under the seat the seats can be placed close together, as is desirable in.- a row arrangement, and it will further be seen that no part of. one seat interferes with the freedomrof movement of the legs of thevoccupant of an adjacent seat.

I claim as my invention:

1. A floating chair type seat, including a chair frame comprising a seat part and a back part rigidly connected to said seat part, a subframe including a pair of transversely spaced posts rising from its rear end and arranged directly under the lower part of said back part, means arranged wardly projecting arm, 10,

directly under the lower part of said back part and connecting said posts with said chair frame and guiding said chair frame in its vertical movements and preventing said chair frame from tipping and twisting, comprising a pair of horizontally disposed yokes arranged one above the other and each having a horizontal cross part and a pair of laterally extending generally horizontal arms, means pivotally connecting said horizontal cross part of each yoke at two transversely spaced points to said chair frame and means pivotally connecting the said arms of each yoke to said posts and means interposed between said subframeand said chair frame for resiliently restraining vertical movements of said chair frame.

2. A floating chair type seat, including a chair I frame comprising a seat rigidly connected to said seat part, a subframe including a base part and a structure projecting upwardly from the rear part of said. base part and arranged directly under' the lower part of part and a back part said back part, adepending' structure secured to the rearpart of said seat part of said chair frame and projecting downwardly therefrom, means arlower part of said back jecting structure of said subframe and said depending structure of said chair frame and guidingsaid chair frame in its vertical movements and preventing said chair frame from tipping and twisting; comprising apair of horizontally disposed yokes arranged one above the other and each having a horizontal cross part and a'pair of laterally extending generally horizontal arms,

means pivotally connecting said horizontal cross part of each yoke at two transversely spaced points to one of said 'structures, and means piv-I otally connecting the said arms of each yoke to the other of said structures and means interposed between said subframe and said chair frame for frame, a chair frame comprising a seat a back part rigidly connected with said seat part,

resiliently restraining vertical movementsof said chair frame.

3. A floating chair type seat, including-a base i I casting having a central a cylindrical well adapted lubricant, a subframe comprising a casting including 'atcentral post revolvably mounted in a vertical axis, a fora pair of horizontally said bore to swing about spaced rearwardly projecting arms and a post arising from the rear end of each of'said rearwardly projecting arms, ing a seat part and a achair frame comprisrectly under the lower part of said back part-and interposed between said from tipping and twisting, comprising a pair of horizontally disposed yokes arranged one above the other and each having a horizontal cross part and a pair of laterally extending generally horizontal arms, means pivotally connecting said: x

of each yoke at twotransversely spaced points to said chair frame and means pivotally connecting thesaid arms of each horizontal cross part yoke at two transversely spaced points to said posts, and means interposed between said.for-,

type seat, including a subsaid chair frame for guiding said chair frame,

for vertical movements and preventing said chair frame from tipping and twisting, comprising a pair of horizontally disposed yokes arranged one above the other directly of said back part of said chair frame and each 5. A floating chair type seat, including a submeans interposed between said subframe'and said chair frame for'guiding back part rigidly con nected with said seat'part, means arranged di- 7 posts and said chair frame and guiding said chair frame in its yerti-f cal movements and preventing said chair frame comprising a seat part and part and said chair frame for ve'r-, tical movements and preventing said chair frame from tipping and twisting, comprising apair of being with the seat .part of said chair frame and v frame comprising a seat part and a back part spring means arranged directly under said seat rigidly connected with said seat part, a subpart of said chair frame and interposed between frame including a pair of transversely spaced said subframe and said seat part of said chair posts rising from its rear end and arranged diframe for resiliently restraining vertical move- 5 rectly under the lower part of said back part of ments of said chair frame. said chair frame, means interposed between said 6. A floating chair type seat, including a sub subframe and said chair frame for guiding said frame, a chair frame comprising a seat part and chair frame for vertical movements and preventa back part rigidly connected with said seat ing said chair frame from tipping and twisting, part, means interposed between said subframe m comprisingra pair of horizontally disposed yokes and said chair frame for guiding said chair frame arranged one above the other directly under the for vertical movements and preventing said chair lower part of said back part of said chair frame frame from tipping and twisting, comprising a and each having a horizontal cross part and a pair of horizontally disposed yokes arranged one pair of laterally extending generally parallel arms above the other directly under the lower part of 15 arranged in a generally horizontal plane in the said back part of said chair frame and each havnormal loaded position of said chair frame, means ing a horizontal cross part and a pair of laterally pivotally connecting said horizontal cross part extending generally parallel arms arranged in a of each yoke at two transversely spaced points to generally horizontal plane in the normal loaded one of said frames and means pivotally conposition of said chair frame, means pivotally con- 20 necting the ends of said arms of each yoke at two necting said horizontal cross part of each yoke transversely spaced points to the other of said at two transversely spaced points to said seat frames, the connection between said yokes and part of said chair frame and means for pivotally chair frame being with the seat part of said connecting the end of each of said arms to said chair frame and the connection between said subframe and means interposed between said sub- 25 yokes and subframe being with said posts and frame and said chair frame for resiliently re- 3 means for resiliently restraining vertical movestraining vertical movement of said chair frame. ments of said chair frame. 'I. A floating chair type seat, including a chair ALBERT F. HICKMAN. 

